Switch ManagedBuffer.header to use _modify (#19226)

airspeedswift · web-flow · commit d414ece55686 · 2018-09-11T17:40:43.000-07:00
diff --git a/stdlib/public/core/ManagedBuffer.swift b/stdlib/public/core/ManagedBuffer.swift
@@ -244,8 +244,8 @@ public struct ManagedBufferPointer<Header, Element> : Equatable {
     addressWithNativeOwner {
       return (UnsafePointer(_headerPointer), _nativeBuffer)
     }
-    mutableAddressWithNativeOwner {
-      return (_headerPointer, _nativeBuffer)
+    _modify {
+      yield &_headerPointer.pointee
     }
   }
 

Original file line number	Diff line number	Diff line change
`@@ -244,8 +244,8 @@ public struct ManagedBufferPointer<Header, Element> : Equatable {`
`244`	`244`	`addressWithNativeOwner {`
`245`	`245`	`return (UnsafePointer(_headerPointer), _nativeBuffer)`
`246`	`246`	`}`
`247`		`- mutableAddressWithNativeOwner {`
`248`		`- return (_headerPointer, _nativeBuffer)`
	`247`	`+ _modify {`
	`248`	`+ yield &_headerPointer.pointee`
`249`	`249`	`}`
`250`	`250`	`}`
`251`	`251`